U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8664589 PUBLICATION DATE: 03/09/2004
Name: HANAHAN, TURKEY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 55.1' N ( 32.91830)
USGS Quad: LADSON Longitude: 80° 0.7' W ( -80.01170)
To reach the tidal bench marks from the intersection of Rivers Avenue (U.S.
Highway 52) and Remount Road in North Charleston, proceed east on Remount Road
for 0.56 km (0.35 mi) to Yeamans Hall Road, then turn left and proceed NE on
Yeamans Hall Road for 1.8 km (1.1 mi) to Murry Avenue, then turn left on Murray
Avenue and proceed NW for 1.3 km (0.8 mi) to a small bridge over Turkey Creek.
The bench marks are along Murray Avenue heading south from the bridge. The tide
gage and staff were on the west side of the bridge over Turkey Creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4589 A 1978
DESIGNATION: 866 4589 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 4070
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1681
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 55.1' N ( 32.91830) LONGITUDE: 80° 0.7' W ( -80.01170)
The primary bench mark is a disk set in a concrete monument on the NE side of
Murray Avenue,16.52 m (54.2 ft) SE of the SE corner of the bridge abutment, 13 m
(43 ft) NE of power pole #80202, 5.09 m (16.7 ft) NE of the centerline of Murray
Avenue, and 0.91 m (3.0 ft) SW of power pole #237127.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8664589 PUBLICATION DATE: 03/09/2004
Name: HANAHAN, TURKEY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 55.1' N ( 32.91830)
USGS Quad: LADSON Longitude: 80° 0.7' W ( -80.01170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4589 B 1978
DESIGNATION: 866 4589 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 4071
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1680
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 55.1' N ( 32.91830) LONGITUDE: 80° 0.6' W ( -80.01000)
The bench mark is a disk set in a concrete monument on the SW side of Murray
Avenue near the end of a chain link fence, 82 m (270 ft) SSE of bench mark 4589
A 1978, 16.46 m (54.0 ft) SSE of power pole #262515, 13 m (43 ft) NW of a sewer
manhole cover labeled Sumter Machinery, 9.45 m (31.0 ft) SW of the centerline of
Murray Avenue, 2.44 m (8.0 ft) NE of a concrete fence post, 1.98 m (6.5 ft) SW
of a metal fence post, and 0.03 m (0.1 ft) below ground level.
BENCH MARK STAMPING: 4589 C 1978
DESIGNATION: 866 4589 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 4072
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1679
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 55.0' N ( 32.91670) LONGITUDE: 80° 0.6' W ( -80.01000)
The bench mark is a disk set in a concrete monument north of Murray Avenue near
the entrance to Berkley Hills subdivision, 82 m (270 ft) ESE of bench mark B
1978, 10.67 m (35.0 ft) NE of the centerline of Murray Avenue, 5.18 m (17.0 ft)
NNW of the guy wire anchor to power pole #67208, 1.83 m (6.0 ft) SE of the
easterly brick column marking the entrance to the Berkley Hills subdivision, and
1.52 m (5.0 ft) NE of power pole #67208.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8664589 PUBLICATION DATE: 03/09/2004
Name: HANAHAN, TURKEY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 55.1' N ( 32.91830)
USGS Quad: LADSON Longitude: 80° 0.7' W ( -80.01170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4589 D 1978
DESIGNATION: 866 4589 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 4073
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1678
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 55.1' N ( 32.91830) LONGITUDE: 80° 0.6' W ( -80.01000)
The bench mark is a disk located on the NW side of Bishop Road along a powerline
right of way, 67 m (220 ft) north of the entrance to Berkley Hills subdivision,
9.85 m (32.3 ft) south of a 0.82 m (2.7 ft) diameter pine tree, 6.49 m (21.3 ft)
NW of the centerline of Bishop Road, and 0.91 m (3.0 ft) NE of power pole
#C-27830 with transformer. The bench mark is crimped to the top of a stainless
steel rod driven 5.8 m (19 ft) to refusal, and encased in a PVC pipe and a
concrete kickblock.
BENCH MARK STAMPING: 4589 E 1978
DESIGNATION: 866 4589 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 4074
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1677
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 55.1' N ( 32.91830) LONGITUDE: 80° 0.6' W ( -80.01000)
The bench mark is a disk located on the east side of Bishop Road along the
powerline right of way, 32 m (104 ft) east of the centerline of Bishop Road,
27.74 m (91.0 ft) SW of the NW corner of a brick home, 25.82 m (84.7 ft) SW of
high tension power pole #21, and 1.58 m (5.2 ft) north of power pole #150. The
bench mark is set 3 cm (0.1 ft) below ground level, crimped to the top of a
stainless steel rod driven 5.5 m (18 ft) to refusal, and encased in a PVC pipe
and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8664589 PUBLICATION DATE: 03/09/2004
Name: HANAHAN, TURKEY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 55.1' N ( 32.91830)
USGS Quad: LADSON Longitude: 80° 0.7' W ( -80.01170)
T I D A L D A T U M S
Tidal datums at HANAHAN, TURKEY CREEK based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: September 1978 - November 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8665530 CHARLESTON, COOPER RIVER ENTRANCE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.557
MEAN HIGH WATER MHW = 1.480
MEAN SEA LEVEL MSL = 0.917
North American Vertical Datum NAVD88 = 0.769
MEAN TIDE LEVEL MTL = 0.763
MEAN LOW WATER MLW = 0.047
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4589 A 1978 2.330 0.850
4589 B 1978 3.399 1.919
4589 C 1978 3.237 1.758
4589 D 1978 3.685 2.205
4589 E 1978 3.700 2.220
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8664589 PUBLICATION DATE: 03/09/2004
Name: HANAHAN, TURKEY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 55.1' N ( 32.91830)
USGS Quad: LADSON Longitude: 80° 0.7' W ( -80.01170)
D E F I N I T I O N S
Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch. It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.
The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum. As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.